Bradrpvtec, 31 Dec 2016After update battery drain is a very real thing. I think this time I won't update.Just, do a factory reset after the update when you have battery drain. It is not caused by the update itself, it is caused by apps you installed.

JayLeonard, 30 Dec 2016Separate auto focus and exposure locking in pro mode are already available on marshmallow touc... moreSamsung is always years ahead of the stock Android. (Multi-Windows? lol)
BTW I would suggest ppl that buy new Samsung phone(or even any other phone, even iPhone) never to update OS , or at least not more than one time. If they want their phones to work properly, the way they bought them.
This media pushing ppl to update many times, many years is only to brick your phones and buy new one. Every new OS update is made with new hardware in mind,